On Tue, Mar 04, 2014 at 11:43:55AM +0100, Linus Lüssing wrote:
> On Tue, Mar 04, 2014 at 10:06:14AM +0100, Hannes Frederic Sowa wrote:
> > > diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
> > > index ef66365..fb0e36f 100644
> > > --- a/net/bridge/br_multicast.c
> > > +++ b/net/bridge/br_multicast.c
> > > @@ -1235,6 +1235,12 @@ static int br_ip6_multicast_query(struct net_bridge *br,
> > > (port && port->state == BR_STATE_DISABLED))
> > > goto out;
> > >
> > > + /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
> > > + if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
> > > + err = -EINVAL;
> > > + goto out;
> > > + }
> > > +
> >
> > Shouldn't we allow empty source address, here?
> >
> > Routers are supposed to drop them but bridges care. Linux uses ::
> > as source address as long as no valid LL addresses are available,
> > e.g. at boot-up (RFC3810 5.2.13.).
>
> RFC3810, 5.2.13. refers to MLD reports, not queries, so that
> shouldn't be relevant, section 5.1.14 should apply. Also the
> bridge code only issues queries with a valid link-local source
> address (see br_ip6_multicast_alloc_query() in
> net/bridge/br_multicast.c). Where does Linux use :: for queries?
Sorry, I confused queries with reports.
Your patch looks good, same check as in igmp6_event_query.
Reviewed-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Bye,
Hannes
